It's always scary making a film as I never set anything up or ask anyone to do anything, so I worry that we'll find a story. I have to trust that a film will come out of the journey we embark on. I have many, many sleepless nights.

I'm not generalizing anymore about men and women, because I think these old terms of "masculine" and "feminine" are going very fast with the rise of transgender rights that are questioning what all these categories are.

I don't make 'issue' films. I like making films about rebels or pioneers or people that are doing something.

I don't have any advice at all. I think we all make the films that reflect the kind of people we are; we all make such different films. There's not just one way of doing it.

It makes it very easy. I have a beginning, middle, and end, and I don't film for long - about 20 hours usually for a two-hour film - so it's easily watchable in a week for me and the editor. Once I know who the characters are, I only film those characters, unless somebody else forces their way into the film by a scene happening to them or we meet them by chance.

The magic of documentary is that I keep being surprised and amazed by the things I film.

I meet all these American filmmakers that film for months and months, and it's a mystery to me. I couldn't make a film like that. I have to be very clear in what I'm doing and where it's going, and be very disciplined about what I film.